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<TITLE>[Chapter 23] 23.3 java.beans.Beans (JDK 1.1)</TITLE>
<META NAME="author" CONTENT="David Flanagan">
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<h2 CLASS=sect1><A CLASS="TITLE" NAME="JNUT2-CH-23-SECT-3">23.3 java.beans.Beans (JDK 1.1)</A></h2>

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<P CLASS=para>
The <tt CLASS=literal>Beans</tt> class is never meant to be instantiated;
its static methods provide miscellaneous JavaBeans
features.

<P CLASS=para>
The <tt CLASS=literal>instantiate()</tt> method creates an instance of a
bean.  The specified bean name represents either a
serialized bean file or a bean class file; it is
interpreted relative to the specified <tt CLASS=literal>ClassLoader</tt>
object.  

<P CLASS=para>
The <tt CLASS=literal>setDesignTime()</tt> and <tt CLASS=literal>isDesignTime()</tt>
methods are used to set and query a flag that indicates
whether beans are being used in an application builder
environment.  Similarly, <tt CLASS=literal>setGuiAvailable()</tt> and
<tt CLASS=literal>isGuiAvailable()</tt> set and query a flag that indicates
whether the Java Virtual Machine is running in an
environment in which a GUI is available.  (Note that
untrusted applet code cannot call <tt CLASS=literal>setDesignTime()</tt> or
<tt CLASS=literal>setGuiAvailable()</tt>.)

<P CLASS=para>
The <tt CLASS=literal>isInstanceOf()</tt> method is a replacement for the
Java <tt CLASS=literal>instanceof</tt> operator for use with beans.
Currently, it behaves just like <tt CLASS=literal>instanceof</tt>, but in
the future it may work with beans that consist of a set
of Java objects, each of which provides a different "view" of
a bean.  Similarly, the <tt CLASS=literal>getInstanceOf()</tt> method is a
replacement for the Java cast operator.	It converts a
bean to a superclass or interface type.  Currently, it
behaves just like a cast, but you should use it for future
compatibility with multiclass beans.

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public class <tt CLASS=literal>Beans</tt> extends Object {
    // <tt CLASS=literal>Default Constructor: public Beans()</tt>
    // <tt CLASS=literal>Class Methods</tt>
            public static Object <tt CLASS=literal>getInstanceOf</tt>(Object <tt CLASS=literal>bean</tt>, Class <tt CLASS=literal>targetType</tt>);
            public static Object <tt CLASS=literal>instantiate</tt>(ClassLoader <tt CLASS=literal>cls</tt>, String <tt CLASS=literal>beanName</tt>)
            public static Object <tt CLASS=literal>instantiate</tt>'u'throws IOException, ClassNotFoundException;
            public static boolean <tt CLASS=literal>isDesignTime</tt>();
            public static boolean <tt CLASS=literal>isGuiAvailable</tt>();
            public static boolean <tt CLASS=literal>isInstanceOf</tt>(Object <tt CLASS=literal>bean</tt>, Class <tt CLASS=literal>targetType</tt>);
            public static void <tt CLASS=literal>setDesignTime</tt>(boolean <tt CLASS=literal>isDesignTime</tt>) throws SecurityException;
            public static void <tt CLASS=literal>setGuiAvailable</tt>(boolean <tt CLASS=literal>isGuiAvailable</tt>) throws SecurityException;
}
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